τέλειος

There is a single verse in the Sermon on the Mount that has caused more anxiety in serious Christians than perhaps any other.

“So then, be perfect, as your heavenly Father is perfect.” (Matthew 5:48, NET)

Read in modern English, the verse seems to demand the impossible. The reader is being commanded to be perfect — flawless, sinless, without defect — in the way that God is perfect. The serious Christian who takes the verse at face value, in modern English, faces a problem: he is not sinless; he cannot become sinless in this life; and if the verse means what it appears to say, the entire Christian life is a project of striving for an unreachable goal that crushes him along the way.

But the Greek does not say what the English reader thinks it says. The word translated “perfect” is teleios, and teleios does not mean “flawless” or “sinless” or “without defect” in the way that modern English “perfect” tends to mean. Teleios means complete, mature, brought to its goal, fully developed for its purpose. The Greek word is built on telos, the noun for end or goal or finished state. To be teleios is not to be a moral abstraction free of all imperfection; it is to be the kind of thing that has reached the completion appropriate to its kind. The mature tree is teleios. The completed sacrifice is teleios. The grown adult is teleios as distinguished from the child. The mature Christian is teleios as distinguished from the baby Christian.

This is the entry on teleios. The entry’s main task is to recover what “perfect” actually means in the New Testament — and to push back against the modern English reading that has caused so much anxiety in serious Christians. The teleios of Matthew 5:48 is not “flawless” as the modern reader assumes. It is “mature, complete, fully-conformed to one’s calling, brought to the goal” — and the context of the verse, as we will see, shows what kind of completion is in view.

The Word

τέλειος (teleios), pronounced TEH-lay-os. An adjective, used substantively (as a noun referring to “the mature/perfect one”) and predicatively (describing something as mature/complete). The root noun is telos (τέλος, “end, goal, purpose, completion, finished state”). The family is theologically rich and includes the verb teleioō (τελειόω, “to complete, to bring to its goal, to perfect”), the noun teleiōsis (τελείωσις, “completion, perfection, fulfillment”), and the noun teleiōtēs (τελειωτής, “perfecter, completer” — used of Christ in Hebrews 12:2 as “keeping our eyes fixed on Jesus, the pioneer and perfecter of our faith.”). The adverb teleiōs (τελείως, “completely, perfectly”) rounds out the family.

The English word “teleology” — the study of ends or purposes — descends from this same Greek root. To understand teleios, the English reader does well to think “teleological” rather than “perfectionist.” A thing is teleios when it has reached the end appropriate to its kind, not when it has achieved an abstract flawlessness defined apart from its nature.

The classical Greek background reinforces this:

• An animal teleios for sacrifice — without blemish, fit for offering, suitable for its purpose.
• An initiate teleios in the mysteries — having completed the required rites of initiation.
• A teacher teleios — accomplished, master of his craft, having reached the maturity of his discipline.
• A philosopher teleios — having reached the goal of philosophical understanding.
• An athlete teleios — having completed training, ready for competition.
• An adult teleios — having reached the maturity of full development as distinguished from the child.

In each case, teleios names a thing that has reached the completion appropriate to its kind. The criterion is not flawlessness in the abstract but maturity-toward-purpose. The mature sacrificial lamb is teleios not because it is metaphysically flawless but because it meets the standard appropriate to a sacrificial offering. The mature philosopher is teleios not because he has achieved infallible knowledge but because he has reached the maturity appropriate to his discipline.

The Hebrew background reinforces this. The Old Testament word the Septuagint frequently translates with teleios is tamim — “whole, complete, sound, unblemished, blameless.” Tamim describes integrity and wholeness, not metaphysical perfection. Noah was tamim in his generations (Gen 6:9) — not sinless in the abstract, but whole and blameless in covenant integrity relative to his time. God’s command to Abraham was “Walk before me and be blameless” (Gen 17:1, NET) — not “be metaphysically flawless” but “be whole, complete in covenant relationship.” The Hebrew concept focuses on integrity and wholeness, and the Greek teleios picks up this same conceptual world.

The shift to modern English “perfect” has imported a different conceptual world — one shaped by Enlightenment notions of abstract metaphysical perfection, mathematical precision, and idealized standards of moral conduct. The Greek teleios does not mean what the modern English word suggests. The careful Bible reader, encountering “perfect” in his New Testament, should consciously translate the modern English back into the original conceptual world: “complete, mature, brought to its goal.”

Range of Meaning

In its New Testament usage, teleios and its cognates cover:

• Complete, brought to completion. The basic sense.
• Mature, fully-grown, as opposed to immature or infant. The developmental sense, common in Paul and Hebrews.
• Whole, lacking nothing. The integrative sense, common in James.
• Fully-conformed to one’s calling, purpose, or kind.
• Final, ultimate. The eschatological sense — the perfect/complete that is to come.
• Sinless. Rare in the New Testament and typically applied specifically to Christ or to the eschatological state.

The dominant senses are “mature” and “complete.” The “sinless” sense is exceptional. Translation choices in modern English Bibles vary: some retain “perfect,” while others use “mature,” depending on context. Neither is wrong; the careful reader holds both in mind.

Where You’ll Meet It

“So then, be perfect, as your heavenly Father is perfect.” (Matthew 5:48, NET)

The verse already treated. The context matters: Matthew 5:43–47, the immediately preceding paragraph, has Jesus commanding the love of enemies and prayer for persecutors. The structure is: “You have heard that it was said, ‘Love your neighbor’ and ‘hate your enemy.’ But I say to you, love your enemy and pray for those who persecute you, so that you may be like your Father in heaven, since he causes the sun to rise on the evil and the good, and sends rain on the righteous and the unrighteous. For if you love those who love you, what reward do you have? Even the tax collectors do the same, don’t they? And if you only greet your brothers, what more do you do? Even the Gentiles do the same, don’t they?” Then the closing sentence: “So then, be perfect, as your heavenly Father is perfect.” The “therefore” connects the teleios command directly to the love-of-enemies command. The kind of perfection being called for is shown by the context. It is the completion of love that extends even to enemies — the mature mercy that mirrors the Father’s mercy.

The parallel in Luke is decisive. Luke 6:36 records what is probably the same teaching with a different summary: “Be merciful, just as your Father is merciful.” Where Matthew has teleios, Luke has oiktirmōn (merciful, compassionate). The two summaries point to the same content. The teleios of Matthew 5:48 is the completion of mercy and love that Luke 6:36 names directly. To be teleios as the Father is teleios means to extend love and mercy even to the undeserving, as the Father does, in the maturity of love that defines the divine character.

“Jesus said to him, ‘If you wish to be perfect, go sell your possessions and give the money to the poor, and you will have treasure in heaven. Then come, follow me.’” (Matthew 19:21, NET)

The rich young ruler. Jesus tells him that being teleios — complete in his discipleship — requires the surrender of his wealth and following Christ. The verse is not saying “if you would be sinless, sell everything”; it is saying “if you would be complete in discipleship, the obstacle you have not yet surrendered must be surrendered.” The completion in view is the maturity of following Christ unreservedly, not a moral state of flawlessness.

“Brothers and sisters, do not be children in your thinking. Instead, be infants in evil, but in your thinking be mature.” (1 Corinthians 14:20, NET)

Paul to the Corinthians on spiritual gifts. The word translated “mature” is teleioi. The opposite is “children” (paidia). The contrast is developmental: child versus adult, immature versus mature. Paul is not asking the Corinthians to be sinless in their thinking; he is asking them to grow up — to have the mature judgment that distinguishes the adult Christian from the child Christian. This is one of the clearest New Testament uses of teleios in the developmental rather than the moral sense.

“Not that I have already attained this—that is, I have not already been perfected—but I strive to lay hold of that for which Christ Jesus also laid hold of me. Brothers and sisters, I do not consider myself to have attained this. Instead I am single-minded: Forgetting the things that are behind and reaching out for the things that are ahead, with this goal in mind, I strive toward the prize of the upward call of God in Christ Jesus. Therefore let those of us who are “perfect” embrace this point of view. If you think otherwise, God will reveal to you the error of your ways.” (Philippians 3:12–15, NET)

Paul’s compressed paradox. In verse 12, he says he is not yet teteleiōmai — has not been “completed” or “perfected.” In verse 15, he says “let those of us who are ‘perfect’ embrace this point of view” think a certain way. The same word family appears in opposite directions within the same paragraph. The resolution: there is a final teleios (the eschatological completion) that Paul has not yet reached, and there is a present teleios (the developmental maturity) that Paul and others have reached. The mature Christian (teleios in the present sense) is precisely the one who knows he has not yet reached the final goal (teleios in the eschatological sense). Maturity in this life involves the recognition that the final perfection is still to come.

This is one of the most pastorally important passages on teleios in the New Testament. Paul, the apostle, the great missionary, the writer of Romans and Galatians, says he is not yet “perfect” in the final eschatological sense. The believer who reads Paul honestly will not claim more than Paul claimed. Christian maturity (present teleios) is, in part, the honest acknowledgment that final completion (eschatological teleios) has not yet arrived.

“But solid food is for the mature, whose perceptions are trained by practice to discern both good and evil. Therefore we must progress beyond the elementary instructions about Christ and move on to maturity, not laying this foundation again: repentance from dead works and faith in God,” (Hebrews 5:14–6:1, NET)

Hebrews. The “mature” of 5:14 is teleiōn; the “maturity” of 6:1 is teleiotēta. The contrast is again developmental: milk versus solid food, baby versus mature believer. The author is calling for growth in doctrinal understanding and Christian discernment — from the elementary doctrines to the deeper teachings, from the basics to the maturity appropriate to seasoned believers. The maturity is not sinlessness; it is the trained discernment that comes from years of walking in the faith and engaging the Scriptures deeply.

“And let endurance have its perfect effect, so that you will be perfect and complete, not deficient in anything.” (James 1:4, NET)

James. The word “perfect” is teleioi and the word “complete” is holoklēroi (whole, intact in all parts). The context is endurance through trials. The “perfection.” James calls for is the completeness produced by sustained endurance — the wholeness of character that the trial has matured. The image is of a craftsman finishing his work: trial does its work; endurance does its work; the believer is brought to completeness. This is not the perfection of “having no remaining sin.” It is the maturity of “having been shaped by the trial into the wholeness God intended.”

“There is no fear in love, but perfect love drives out fear because fear has to do with punishment. The one who fears punishment has not been perfected in love.” (1 John 4:18, NET)

John. “Perfect love” is hē teleia agapē. “Has been perfected” is teteleiōtai. The “perfection” here is the completion of love — love that has reached its full development in the believer through the gospel of Christ’s love demonstrated for him. As the believer receives and remains in Christ’s love, his own love grows toward completion; as that love grows, fear of punishment is displaced; the believer who fully receives the gospel’s love no longer fears the day of judgment because his standing is in Christ. The perfection is the gospel’s work, not the believer’s achievement.

What Confessional Lutherans Hear

When confessional Lutherans hear teleios, two things stand out that the broader Christian conversation has often softened or misread.

First, teleios is mature completion, not sinless flawlessness. The Lutheran tradition has read the teleios passages through the lens of the gospel — the Christian is teleios in Christ (standing, gift, alien righteousness imputed) and is being brought toward teleios in actual life (process, growth, sanctification’s continuing work) and will be fully teleios at the resurrection (the eschatological completion that the gospel promises). The simul iustus et peccator structure that we treated in Hagios applies here as well. The Christian is perfect/complete in Christ’s righteousness; the Christian is still being made mature through the Spirit’s work; both are true at once; neither contradicts the other.

This shapes how the Lutheran tradition reads Matthew 5:48. The verse is not commanding sinless flawlessness — which the rest of the New Testament shows the believer cannot attain in this life (1 John 1:8 — “if we say we do not bear the guilt of sin, we are deceiving ourselves”). The verse is commanding completion-in-love, the extension of mercy even to enemies, conformity to the Father’s character in love-of-the-undeserving. The Lukan parallel (Luke 6:36, “be merciful”) confirms the reading. The high call is not sinless flawlessness; the high call is the maturity of love that extends even to enemies.

This reading does not soften the demand. Loving enemies is hard. Praying for persecutors is hard. Extending mercy to those who do not deserve it is one of the most difficult things the Christian is called to do — and one of the clearest marks that the Spirit is at work in the believer’s life. The teleios of Matthew 5:48 is a high call. But it is a different call than “be flawless” — and the difference matters pastorally. The believer who hears “be perfect” as “be sinless” hears an impossible demand that crushes him. The believer who hears “be perfect” as “be complete in love, as your Father is complete in love” hears a demand that, while difficult, is appropriate to the kind of being he has been remade into through baptism.

This pushes back against the Wesleyan/Holiness doctrine of entire sanctification, which holds that the believer can be entirely sanctified — made fully sinless — in this life through a second work of grace subsequent to conversion. We treated this in Hagios and need not repeat the analysis here, except to note that the teleios texts are often cited in support of the entire-sanctification position, and the Lutheran reading of these texts does not sustain it. The teleios the New Testament calls believers to is mature-completion-in-love, not metaphysical sinlessness; and Philippians 3:12 has the apostle Paul explicitly saying he has not yet been “perfected” in the final sense. If Paul could not claim final teleios in this life, no believer can claim it after him.

Second, Christian maturity is the Spirit’s work through the means of grace, not the believer’s achievement through religious effort. The teleios the New Testament calls for is produced. It is not summoned by gritted teeth, by self-discipline, by perfectionist striving. It is grown — in the believer who remains in the means of grace by which the Spirit works. The Christian moves toward teleios the way an oak tree moves toward maturity: through time, through nourishment, through the conditions God has provided, through the continuing presence of the One who started the work and will complete it.

Hebrews 12:2 names Christ as “keeping our eyes fixed on Jesus, the pioneer and perfecter of our faith.” The perfecter is Christ, not the believer. The completion of faith is His work, applied through the Spirit, mediated through the means of grace, brought to its final eschatological consummation at the resurrection. The believer’s part is to remain in the means by which the teleiōtēs does His work — receiving the Word, returning to baptism, attending the Supper, confessing sin and receiving absolution, walking in faith and love through the daily ordinary stations of Christian vocation.

This pushes back against:

• Modern perfectionist piety that locates the Christian’s confidence in his own progress toward holiness, treating spiritual maturity as a personal achievement to be measured, celebrated, or compared. The Lutheran response: maturity is the Spirit’s work; the believer’s part is to remain in the means; comparison with other believers is not the New Testament’s concern.
• The opposite error of treating teleios texts as meaningless or unreachable, and so dismissing the call to maturity altogether. Some popular grace-emphasis preaching has so resisted perfectionism that it has muted the call to growth entirely. The Lutheran response: the call to maturity is real, and the Spirit produces it in the believer through the means of grace. Maturity is real; it is gift; it is fruit of the Spirit’s work; and it is what the New Testament calls believers to.

The pastoral payoff: when you wonder whether you are “mature enough” as a Christian, the question is partly the wrong question. The Spirit produces maturity through the means of grace; the believer’s part is to remain in those means and let the Spirit do His work. Maturity is not a static state to be achieved but a continuing direction of growth, with its final completion still ahead. The Christian who has been walking with Christ for fifty years is more mature than he was at conversion, but he is still being made mature. The Christian who has been walking with Christ for fifty days is still being made mature, too. The work is the same. The Spirit is the same. The Christ toward whom the believer grows is the same. The completion is at the resurrection. Until then, the growth continues.

Where People Get It Wrong

Three common ways.

The first is reading teleios as “sinless flawlessness.” The modern English meaning of “perfect” has shifted under the influence of Enlightenment ideals of abstract perfection, mathematical precision, and idealized moral standards. The Greek does not carry these connotations. The Lutheran response: teleios is “mature, complete, brought to its goal” — not sinless. The careful Bible reader, encountering “perfect” in his New Testament, should translate the modern English back into the original conceptual world.

The second is Wesleyan/Holiness perfectionism — the doctrine that the believer can attain entire sanctification, full sinlessness, in this life through a second work of grace. Already treated in Hagios and reinforced here. The teleios texts do not sustain this doctrine; Paul’s explicit “I am not yet perfected” in Philippians 3:12 is decisive.

The third is the opposite — treating teleios texts as meaningless or unreachable, and so dismissing the call to maturity. Some modern grace-emphasis preaching has muted the call to growth in holiness, leaving believers without orientation toward the maturity the Spirit is producing in them. The Lutheran response: the call to maturity is real, even though final teleios is eschatological; the Spirit produces real growth in this life through the means of grace; the believer is called to remain in those means and let the teleiōtēs do His work.

A fourth pattern worth noting: confusing teleios with works-righteousness. Treating maturity as something the believer earns through religious performance rather than something the Spirit produces through Word and Sacrament. The Lutheran response: teleios is fruit of the Spirit’s work, given through the means of grace, not summoned by religious effort. The believer who tries to manufacture maturity by trying harder has misunderstood the structure of Christian growth.

So What

You are being made teleios. The Spirit is at work in you through Word and Sacrament. The completion of your faith — the final teleios — is the glorification at the resurrection. In the meantime, the Spirit grows you toward maturity in love, in faith, in patience, in conformity to Christ’s character. The growth is real. The completion is not yet. Both are true. The “perfect” in your New Testament is not commanding the impossible; it is naming the direction in which the Spirit is moving you, and the goal toward which the gospel orients your whole life.

For Sunday school teachers and Bible study leaders: when you teach a passage with “perfect” or “mature” language, watch for teleios. Help your students see that “perfect” in the New Testament does not mean “sinless flawlessness” but “mature, complete, brought to its goal.” Matthew 5:48 is not commanding the impossible; it is commanding the difficult — completion of love that extends even to enemies, conformity to the Father’s mercy. Help your students see that they are being made teleios through the Spirit’s ongoing work, not failing to be teleios by their inevitable shortcomings. The believer who reads “be perfect” as “be flawless” is being crushed by a demand the Greek does not actually make. The believer who reads “be perfect” as “be complete in the maturity of love” hears the New Testament’s actual call.

For yourself: when you feel the weight of “be perfect,” remember that the Greek does not say what the English suggests. The teleios is mature, complete, brought to its goal — not flawless. You are being made mature. The Spirit is at work. The completion will come at the day Christ returns. In the meantime, you walk in the means of grace, you receive what Christ gives, you serve your neighbor, you confess your sin, and you let the Spirit grow you toward the goal. The work is His. The fruit is given. The final completion is sure. The teleiōtēs who founded your faith will perfect it.